CN1268991C - Emission controlling apparatus and image forming apparatus - Google Patents
Emission controlling apparatus and image forming apparatus Download PDFInfo
- Publication number
- CN1268991C CN1268991C CNB031098444A CN03109844A CN1268991C CN 1268991 C CN1268991 C CN 1268991C CN B031098444 A CNB031098444 A CN B031098444A CN 03109844 A CN03109844 A CN 03109844A CN 1268991 C CN1268991 C CN 1268991C
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- China
- Prior art keywords
- voltage
- intensity
- laser
- control equipment
- current
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- Expired - Fee Related
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
Abstract
There is provided an emission control apparatus with which it is capable of variably controlling the intensity of a light beam to be set, in a stable manner and at a low cost without increasing the circuit size. A semiconductor laser diode LD emits a light beam. A photo diode PD detects the intensity of the light beam emitted from the semiconductor laser diode LD. A driving circuit supplies driving current to the semiconductor laser diode LD. A switching section switches the driving current according to a video signal. An input terminal receives a pulse width modulation signal. A smoothing. circuit smoothes the received pulse width modulation signal. A laser driver controls a value of the driving current according to smoothed voltage obtained by the smoothing circuit such that the detected intensity of the light beam is equal to a target intensity.
Description
Technical field
The present invention relates to a kind of launch control equipment, be used to control from as a for example semiconductor laser emitted laser intensity and a kind of imaging device such as electrofax laser printer, duplicating machine or laser facsimile that comprises this launch control equipment that is used for writing the light source of image information.
Background technology
Fig. 6 is a calcspar, is illustrated in the ordinary construction of a control system in the electricity photograph laser printer that comprises a kind of conventional laser opertaing device.
In the control system in Fig. 6, from a semiconductor laser diode 301 (the right to Fig. 6) emitted laser Shu Youyi collimation lens 302 collimation forward, and by polariscope 303 skews that comprise a rotating polygon mirror to shine on the photosensitive drum 305 through f θ lens 304.Photosensitive drum 305 is electrified its surface in advance equably by an electrifier.Photosensitive drum 305 responses are rotated by the front and back scanning of the imaging spot of rotating polygon mirror rotation in the direction (axially) of the rotation axis of photosensitive drum 305, thus the whole surface of the imaging region of scanning on photosensitive drum 305.Should be noted that at photosensitive drum laser beam is the scanning imagery zone not only in its axial front and back scanning, and scanning is provided at the fringe region (non-imaging region) at the place, imaging region both sides on the photosensitive drum 305.
Photodetector 306 be provided on the sweep trace of laser beam some place and outside imaging region, and survey in each scanning laser beam by the rotating polygon mirror skew to produce a BD signal.According to the BD signal from photodetector 306 transmission, signal processing circuit 307 control wherein are applied to timing on the semiconductor laser control circuit 308 of a Laser Control Equipment 300 to a picture signal.
Semiconductor laser control circuit 308 bases are from signal processing circuit 307 image transmitted signal connection/cut-out semiconductor laser diodes 301, to form an electrostatic latent image on photosensitive drum 305.Electrostatic latent image is developed by a developing device, and is transferred on paper etc. by a transfer printing device.
On the other hand, the laser beam of launching back from semiconductor laser diode 301 (among Fig. 6 left) drops on the photodetector of being made up of photodiode 309, and the intensity of photodetector 309 exploring laser light bundles.Then, according to an output signal control semiconductor laser control circuit 308, equal a desired value as the PD monitor part 310 of a control circuit thereby make to become from the light intensity of semiconductor laser diode 301 outputs from photodetector 309.At this moment, PD monitor part 310 provides control, thereby regulate the current value of the corresponding light-emitting component that is used for driving semiconductor laser diode 301 according to the external signal corresponding with corresponding light-emitting component, equal a fixed value to cause to become, and remain on the regulated value place from the intensity of the light beam of corresponding light-emitting component output.
Fig. 7 is a circuit diagram, be illustrated in the detailed configuration of the Laser Control Equipment 300 among Fig. 6, and Laser Control Equipment 300 is by using the sample retentive control to provide the control system of APC (automated power control) control to form, and this is to be used for one of conventional method of controlling laser.
As shown in Figure 7, Laser Control Equipment comprises: a Laser Driven part 211 drives semiconductor laser diode 301; A resistance 202, restriction supplies to the electric current of semiconductor laser diode 301; An APC control section 212, control is from the light intensity of semiconductor laser diode 301 emissions; A sample keeps capacitor 203, when at APC control period emission laser, determine charges accumulated: PD monitor part 310, according to by a resistor 206 from the flow through electric current of the photodetector 309 that comprises a photodiode of the voltage detection of current conversion; And a band gap 217, when at APC control period emission laser, supplies with the reference voltage that the current/voltage of 309 standby current of the photodiode that is used to flow through is changed.
By means of the Laser Control Equipment 300 by above structure, PD monitor part 310 makes the current-voltage conversion of its resistor 206 according to the standby current of the photodiode 309 of flowing through from the light intensity of semiconductor laser diode 301 emissions.Then the voltage that generates is applied on the input end of a comparer 405 in APC control section 212.Another input end of comparer 405 is connected on the band gap 217, thereby the voltage from 310 outputs of PD monitor part is compared with the reference voltage of supplying with from band gap 217.
An output terminal of comparer 405 is connected on the input end of the voltage controller 407 that comprises a feedback control loop, thereby control to be applied to the voltage on the Laser Driven part 211.According to the voltage of control like this, Laser Driven part 211 makes semiconductor laser diode 301 emission laser.By this way, control is from the intensity of semiconductor laser diode 301 emitted laser.
Control radiative intensity by this way and can in short time period, regulate laser intensity, therefore, the scan period of edge region therein laser beam in its single pass of axial scan of photosensitive drum 305, can provide APC (APC between so-called line).
Above-mentioned conventional laser opertaing device according to magnitude of voltage that during APC, is converted to and the reference voltage control laser intensity supplied with from band gap 217 by the current-voltage of the standby current of the photodiode 309 of flowing through, in order to change the laser intensity that will be provided with, can imagine a kind of method that wherein changes the setting of reference voltage.For example, realize that a kind of circuit of this method disposes like this, thereby resistance is connected in parallel with the circuit that reference voltage is set, to pass through optionally on/off of a switch.Yet this configuration has the problem of circuit size and cost increase.
And, in order to control the intensity of laser changeably, a kind of method has been proposed, wherein the magnitude of voltage that the current-voltage by standby current is converted to carries out analog to digital conversion, and according to digital value formation voltage compare with a predetermined reference voltage (disclosing 10-335732 number) with reference to Jap.P..According to this method, although laser intensity might freely be set, regulating laser intensity needs the plenty of time.Reason for this reason, high-speed printer (HSP) for example edge region scan period therein laser beam in its single pass of axial scan of photosensitive drum 305, can not provide APC, therefore, needing to provide APC (APC between so-called page or leaf) during every page of printing.
Summary of the invention
Therefore one object of the present invention is, in a suitable manner and provide with low cost a kind of control setting changeably beam intensity launch control equipment and do not increase circuit size.
Another object of the present invention is, a kind of imaging device that comprises above launch control equipment and the suitable strength of the light beam that is used for printing can be set is provided.
In order to realize above purpose, in a first aspect of the present invention, provide a kind of launch control equipment, comprising: light-emitting component, launch a light beam; Light receiving element is surveyed the intensity from described light-emitting component emitted light beams; Driving element supplies to described light-emitting component to drive current; Switching device switches drive current according to a vision signal; Receiving end receives a pulse width modulating signal; Level and smooth device, the level and smooth pulse width modulating signal that receives; And controller, according to the value of the smooth voltage controlling and driving electric current that is obtained by described level and smooth device, thereby the detected intensity of light beam equals a target strength.
Best, launch control equipment further comprises: current-voltage converter becomes voltage to the corresponding current conversion of detected intensity with the light beam of exporting from described light receiving element; And comparer, voltage and smooth voltage that switching current is obtained compare; Wherein said controller is according to the value of comparative result controlling and driving electric current.
Wish that more launch control equipment further comprises the stabilizing device of the amplitude of stablizing the received pulse bandwidth modulation signals.
Wish that launch control equipment further comprises: current generator produces electric current according to smooth voltage; And stream-electric pressure converter, by electric current that described current generator is produced with become voltage with current conversion that the corresponding current summation of detected intensity from the light beam of described light receiving element output obtains together; Wherein said controller is according to the Control of Voltage drive current from current conversion.
Wish that more launch control equipment further comprises the stabilizing device of the amplitude of stablizing the received pulse bandwidth modulation signals.
In order to realize above other purpose,, provide a kind of imaging device that comprises above-mentioned launch control equipment in a second aspect of the present invention.
By the following detailed description of carrying out in conjunction with the accompanying drawings, make above purpose of the present invention and other purpose, feature, and advantage more obvious.
Description of drawings
Fig. 1 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of first embodiment of the invention;
Fig. 2 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of second embodiment of the invention;
Fig. 3 is a view useful when explaining voltage amplitude how to stablize pwm signal;
Fig. 4 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of third embodiment of the invention;
Fig. 5 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of fourth embodiment of the invention;
Fig. 6 is a calcspar, and expression comprises a kind of ordinary construction of control system of electricity photograph laser printer of conventional laser opertaing device; And
Fig. 7 is a circuit diagram, the detailed construction of Laser Control Equipment in the presentation graphs 6.
Embodiment
With reference to the accompanying drawing of expression embodiments of the invention, will describe the present invention in detail now.
Fig. 1 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of first embodiment of the invention.
Be used for replacing the conventional laser opertaing device 300 in the control system of the electricity photograph laser printer in Fig. 6 according to a kind of Laser Control Equipment 500 of present embodiment.
In Fig. 1, a semiconductor laser part 107 comprises: a semiconductor laser diode LD, front and back emission of lasering beam; With a photodiode PD, receive emission of lasering beam (returning bundle) backward as a photodetector with from LD.From LD forward the emitted laser bundle be used for forming an electrostatic latent image, as in the prior art.
CPU in input end 101 dc controller never that represent, that be provided at Laser Control Equipment 500 outsides receives a pwm signal that is used for being provided with laser intensity reference voltage V f.CPU is transferred to its pulse width and the corresponding pwm signal of laser intensity that will be provided with the input end 101 of Laser Control Equipment 500.
Pwm signal has the voltage amplitude of approximate 3.6V, and its frequency is far below the frequency of the vision signal of later description.
Pwm signal is input to the smoothing circuit 103 that comprises a resistance R 1 and a capacitor C1, thereby pwm signal is converted to DC voltage from a pulse signal.Be applied on the input end V1 that a laser intensity that is provided at the laser driver 104 is provided with amplifier 105 from the generation DC voltage of smoothing circuit 103 output.Be applied to voltage on the input end V1 and be set to be used in laser intensity reference voltage V f among the so-called laser APC.
An input end 108 of the vision signal of image processing section input that it is never represented is connected on the switching part 109 in the driving circuit 106 that is provided in the laser driver 104.
To provide the description of APC operation now, and use the photodiode PD of semiconductor laser part 107 to carry out this operation by monitoring laser intensity.
Photodiode PD produce one with electric current from the corresponding electric current of semiconductor laser diode LD emitted laser intensity (probe current) I1.By a variohm VR2 electric current I 1 is converted to a voltage Vm (laser intensity monitor voltage), and the voltage Vm that generates is applied on the input end V2 that laser intensity is provided with amplifier 105.Electric current I 1, voltage Vm, and variohm VR2 between relation represent by Vm=I1*VR2.
Laser intensity is provided with amplifier 105 laser intensity monitor voltage Vm is compared with laser intensity reference voltage V f, and the result exports an output voltage V 3 as a comparison.
The output terminal that laser intensity is provided with amplifier 105 is connected on the driving circuit 106.Driving circuit 106 produces drive current according to the output voltage V 3 that amplifier 105 outputs are set from laser intensity, and drive current is supplied to semiconductor laser diode LD, thus the laser that the semiconductor laser diode LD emission has target light intensity.
Should be noted that switching part 109 response in driving circuit 106 switches through the vision signal of input end 108 inputs, and thereby, the flicker of semiconductor laser diode LD response vision signal, thereby form image.
According to present embodiment, because Laser Control Equipment is configured to the pwm signal from the outside input is used as laser intensity reference voltage V f, as the reference voltage in APC, so might control the intensity of laser changeably by means of a kind of simple-arranged.As a result, the imaging device such as the electricity photograph laser printer that comprises above-mentioned Laser Control Equipment can be provided for the optimum laser intensity of imaging.
Explanation in passing, the amplitude of considering pwm signal may be accompanyed or follow the fact of the variation fluctuation of the voltage that the power supply of the main body of laser printer supplies with, if wish to require high precision, and then when the assembling printer and when the replacement scanner unit, the adjusting power source voltage.
To provide the description of second embodiment now.Be outside second embodiment and first embodiment different, stablize the voltage amplitude of pwm signal.
Fig. 2 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of second embodiment of the invention.Indicate by identical label with those corresponding elements and parts among Fig. 1, and the descriptions thereof are omitted.
In the present embodiment, with first embodiment in identical laser intensity be provided with in the system, a stabilizing circuit 111 and a buffer circuit 102 are provided in the scanner unit 110, so that stablize the voltage amplitude of pwm signal.Pwm signal is input to buffer circuit 102, and converts the voltage with uniform amplitude to according to the output voltage of supplying with from stabilizing circuit 111, so that from 102 outputs of buffering circuit.
Provide the description of the operation of buffer circuit 102 now.
The output voltage that is provided with of supposing stabilizing circuit 111 is 4V, if the pwm signal that its amplitude is fluctuateed in 3.0 to 3.6V scope is input to buffer circuit 102, then the voltage amplitude of the pwm signal by buffer circuit 102 is constant at the 4V place.As a result, can reference voltage V f be set stabilized lasers intensity.
According to present embodiment, in scanner unit 110, provide stabilizing circuit 11 and buffering circuit 102 to disappear except when the necessity of adjusting supply voltage when assemble printer and when replacing scanner unit 110.
Provide the description of third embodiment of the invention now.
In above-mentioned first and second embodiment, the smooth voltage of pwm signal is provided, the laser intensity that amplifier 105 is set as laser intensity is provided with reference voltage V f, it is variable according to the pulse width of pwm signal to make laser intensity that reference voltage V f is set, thereby can control laser intensity changeably, but in the present embodiment, it is variable not make laser intensity that reference voltage V f is set, but according to laser intensity, by the electric current according to pwm signal is added on the probe current I1 that is produced by photodiode PD, can control laser intensity changeably.
Fig. 4 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of third embodiment of the invention.Indicate by identical label with those corresponding elements and parts among Fig. 1, and the descriptions thereof are omitted.
The pwm signal that is input to input end 101 supplies to smoothing circuit 103, as among first embodiment.The output terminal of smoothing circuit 103 is connected on the input end of a constant-current circuit 201.Constant-current circuit 201 is configured to the output voltage output current according to smoothing circuit 103.Particularly, constant-current circuit 201 comprises an operational amplifier OP1, NPN transistor Tr1, PNP transistor Tr 2, PNP transistor Tr 3, PNP transistor Tr 4, and variohm VR1.
To provide the description of the operation of present embodiment now.
At first, when on the positive input terminal that the output voltage of smoothing circuit 103 is applied to operational amplifier OP1, connect transistor Tr 1.This connects transistor Tr 4, and therefore connects transistor Tr 2 and transistor Tr 3.Thereby, electric current I 2 transistor Tr 1 of flowing through.Operational amplifier OP1 provides FEEDBACK CONTROL then, thereby changes electric current I 2, equals the input voltage value of pwm signal up to the value of I2 * VR1.Transistor Tr 2, Tr3 and Tr4 constitute a current mirror circuit, wherein the collector current I3 of transistor Tr 3 are arranged to equal I2.
By the collector current I3 of the probe current I1 of photodiode PD, transistor Tr 3, and the resistance value of variohm VR2 determine laser intensity monitor voltage Vm, thereby Vm=(I1+I3) * VR2.
Laser intensity is provided with amplifier 105 and then laser intensity monitor voltage Vm is provided with reference voltage V f with laser intensity and compares, and driving circuit 106 intensity that is provided with from semiconductor laser part 107 emitted laser according to the output voltage V 3 that amplifier 105 outputs are set from laser intensity of result based on the comparison.Thereby, can launch laser with stationary mode.
As mentioned above, according to present embodiment, with be superimposed upon according to the corresponding collector current I3 of the electric current of pwm signal according on the probe current I1 that produces by photodiode PD from the intensity of semiconductor laser diode LD emitted laser, thereby make laser intensity monitor voltage Vm variable.By this way, control laser intensity changeably.
Explanation in passing, according to present embodiment, the amplitude of considering pwm signal may be accompanyed or follow the change in voltage that the power supply of laser printer main body supplies with and the fact that fluctuates, if the high precision of requirement, then wish when the assembling printer and when replacing scanner unit, to regulate power source voltage.
To provide the description of fourth embodiment of the invention now.The difference of the 4th embodiment and the 3rd embodiment is, stablizes the voltage amplitude of pwm signal.
Fig. 5 is a circuit diagram, and the expression conduct is according to the structure of the Laser Control Equipment of the launch control equipment of fourth embodiment of the invention.Indicate by identical label with those corresponding elements and parts among Fig. 4, and the descriptions thereof are omitted.
In the present embodiment, with the 3rd embodiment in identical laser intensity be provided with in the system, stabilizing circuit 111 and buffering circuit 102 are provided in the scanner unit 110, so that stablize the voltage amplitude of pwm signal.
As among above-mentioned second embodiment, the output voltage that is provided with of supposing stabilizing circuit 111 is 4V, if the pwm signal that its amplitude is fluctuateed in 3.0 to 3.6V scope is input to buffer circuit 102, then the voltage amplitude of the pwm signal by buffer circuit 102 is constant at the 4V place.The Correction circuit I2 of this stable transistor Tr1, thereby because the corrector electric current I 3 of mirror image circuit configuration stable transistor Tr3.
By this way, it is variable making laser intensity monitor voltage Vm, and is not subjected to the influence of the amplitude variations of pwm signal.
According to present embodiment, in scanner unit 110, provide stabilizing circuit 11 and buffering circuit 102 to eliminate when the assembling printer and the necessity of when replacing scanner unit 110, regulating supply voltage.
Making according to above-mentioned launch control equipment of the present invention might be by means of a kind of simple-arranged with stationary mode control bundle intensity changeably, and can not cause the increase of circuit size or AD converter, D/A converter etc. must be provided as in prior art.
And, comprise that the imaging device of above-mentioned launch control equipment can be provided for the optimum laser beam intensity of imaging by means of simple-arranged.
Should be appreciated that, the invention is not restricted to disclosed embodiment, under the situation that does not break away from spirit of the present invention, can carry out various distortion stating embodiment.
Claims (4)
1. launch control equipment comprises:
Light-emitting component is launched a light beam;
Light receiving element is surveyed the intensity from described light-emitting component emitted light beams;
Driving element supplies to described light-emitting component to drive current;
Switching device switches drive current according to a vision signal;
Receiving end receives a pulse width modulating signal, and this signal is being indicated the target strength of light beam;
Level and smooth device smoothly is a smooth voltage with the pulse width modulating signal that is received; And
Controller compares the intensity of detected light beam and the smooth voltage that is obtained by described level and smooth device, and according to the value of comparative result controlling and driving electric current.
2. launch control equipment according to claim 1 further comprises:
Current-voltage converter becomes voltage to the corresponding current conversion of detected intensity with the light beam of exporting from described light receiving element; With
Comparer, voltage and smooth voltage that switching current is obtained compare;
Wherein said controller is according to the value of comparative result controlling and driving electric current.
3. launch control equipment according to claim 2 further comprises the stabilizing device of the amplitude of stablizing the received pulse bandwidth modulation signals.
4. imaging device that comprises launch control equipment according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP110488/2002 | 2002-04-12 | ||
| JP2002110488A JP4125032B2 (en) | 2002-04-12 | 2002-04-12 | Laser control apparatus and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1452030A CN1452030A (en) | 2003-10-29 |
| CN1268991C true CN1268991C (en) | 2006-08-09 |
Family
ID=29243235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031098444A Expired - Fee Related CN1268991C (en) | 2002-04-12 | 2003-04-11 | Emission controlling apparatus and image forming apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6989520B2 (en) |
| EP (1) | EP1363367B1 (en) |
| JP (1) | JP4125032B2 (en) |
| KR (1) | KR100498666B1 (en) |
| CN (1) | CN1268991C (en) |
| DE (1) | DE60332689D1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4608272B2 (en) * | 2004-09-17 | 2011-01-12 | 株式会社リコー | Insulation resistance measuring method and apparatus, and latent image carrier evaluation method |
| KR100666957B1 (en) * | 2005-05-10 | 2007-01-10 | 삼성전자주식회사 | Apparatus and method for controlling injection of laser beam |
| JP5043345B2 (en) * | 2006-02-14 | 2012-10-10 | キヤノン株式会社 | Image forming apparatus |
| JP4046752B2 (en) * | 2006-05-09 | 2008-02-13 | シャープ株式会社 | POWER CIRCUIT DEVICE AND ELECTRONIC DEVICE HAVING THE POWER CIRCUIT DEVICE |
| US8022976B2 (en) * | 2006-06-07 | 2011-09-20 | Lexmark International, Inc. | Laser power switching for alignment purposes in a laser printer |
| US7812551B2 (en) * | 2007-10-19 | 2010-10-12 | American Sterilizer Company | Lighting control method having a light output ramping function |
| US7701151B2 (en) * | 2007-10-19 | 2010-04-20 | American Sterilizer Company | Lighting control system having temperature compensation and trim circuits |
| JP4998808B2 (en) | 2009-03-02 | 2012-08-15 | ブラザー工業株式会社 | Light output device and image forming apparatus provided with the light output device |
| US8982168B2 (en) | 2013-05-21 | 2015-03-17 | Canon Kabushiki Kaisha | Image forming apparatus |
| JP6881926B2 (en) * | 2016-09-23 | 2021-06-02 | キヤノン株式会社 | Image forming device |
| CN110389357B (en) * | 2018-04-19 | 2023-06-02 | 韩商未来股份有限公司 | Camera using light source with object eye protection function |
| JP7154079B2 (en) * | 2018-09-14 | 2022-10-17 | キヤノン株式会社 | Substrate for driving recording device and light-emitting element |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3246247A (en) | 1963-11-18 | 1966-04-12 | Gen Electric | Pulse width to d. c. converter |
| EP0061292B1 (en) | 1981-03-23 | 1986-06-18 | Kabushiki Kaisha Toshiba | Da converter |
| EP0358171B1 (en) * | 1988-09-06 | 1996-03-06 | Canon Kabushiki Kaisha | Light intensity control apparatus |
| JP2945042B2 (en) * | 1989-11-22 | 1999-09-06 | 株式会社リコー | Laser diode drive |
| US5515392A (en) * | 1995-01-05 | 1996-05-07 | Eastman Kodak Company | Laser diode control circuit with power supply compensation network |
| US6185233B1 (en) * | 1999-06-08 | 2001-02-06 | Alcatel | Output power controlled wavelength stabilizing system |
-
2002
- 2002-04-12 JP JP2002110488A patent/JP4125032B2/en not_active Expired - Fee Related
-
2003
- 2003-04-11 US US10/411,301 patent/US6989520B2/en not_active Expired - Lifetime
- 2003-04-11 KR KR10-2003-0022958A patent/KR100498666B1/en active IP Right Grant
- 2003-04-11 EP EP03008496A patent/EP1363367B1/en not_active Expired - Lifetime
- 2003-04-11 DE DE60332689T patent/DE60332689D1/en not_active Expired - Lifetime
- 2003-04-11 CN CNB031098444A patent/CN1268991C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US20030213890A1 (en) | 2003-11-20 |
| JP4125032B2 (en) | 2008-07-23 |
| US6989520B2 (en) | 2006-01-24 |
| KR100498666B1 (en) | 2005-07-01 |
| EP1363367A3 (en) | 2004-12-22 |
| KR20030081168A (en) | 2003-10-17 |
| EP1363367A2 (en) | 2003-11-19 |
| CN1452030A (en) | 2003-10-29 |
| EP1363367B1 (en) | 2010-05-26 |
| JP2003305882A (en) | 2003-10-28 |
| DE60332689D1 (en) | 2010-07-08 |
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